Laboratory condensing device for phenolic resin synthesis

Abstract

The utility model belongs to the technical field of phenolic resin synthesis, and discloses a laboratory condensing device for phenolic resin synthesis, which comprises a reaction kettle, a reflux device connected with the upper end of the reaction kettle, a condensing pipe a connected below the reflux device, a wastewater tank connected with the bottom of the condensing pipe a, two connectors arranged at the upper part of the wastewater tank and connected with the condensing pipe a and the condensing pipe b respectively, the top of the condensation pipe b is connected with a cold trap, one end of the cold trap is connected with the condensation pipe b, and the other end of the cold trap is connected with a vacuum pump; a high-freezing-point solvent is effectively filtered through the filter screen, three-stage condensation is carried out through the condensation pipe a, the condensation pipe b and the cold trap, the condensation effect is improved, extra equipment customization is not needed, the condensation efficiency is high, and the water vapor blocking rate is 90% or above.

Description

Technical Field

[0001] This utility model belongs to the field of phenolic resin synthesis technology, specifically relating to a laboratory condensation device for phenolic resin synthesis. Background Technology

[0002] Phenolic resins are obtained by the condensation polymerization of phenolic resins or their derivatives. They are mainly used to manufacture various plastics, coatings, adhesives and synthetic fibers. Before mass production, small-scale synthesis is often required in the laboratory to test their performance.

[0003] Some phenolic resins require reflux and vacuum dehydration conditions for synthesis, such as linear phenolic resins and methyl phenolic resins, in order to improve reaction efficiency, control molecular weight, and optimize performance. In the synthesis process, the core function of traditional condensation devices is to condense volatile substances and achieve reflux or separation. By connecting a vacuum pump to reduce the system pressure, water or low-boiling-point substances (such as free formaldehyde and residual phenol) can be rapidly evaporated at a lower temperature, avoiding the decomposition or oxidation of resin prepolymers caused by high temperatures. In actual synthesis, the phenol, incompletely condensed phenolic oligomers, or other byproducts produced during the reaction have high freezing points. These substances will solidify or become viscous during condensation because the temperature is lower than their freezing points, leading to blockage of the condenser tube. During vacuum dehydration, the system pressure decreases and the boiling point of water decreases, but because substances such as phenol have high vapor pressure, their volatilization increases. If the condensation efficiency is insufficient, a large amount of phenol vapor will not be fully condensed and will solidify due to a sudden drop in temperature after entering the pipeline before the vacuum pump, causing blockage of the vacuum pump inlet, contaminating the vacuum pump oil, reducing vacuum strength and condensation efficiency, and affecting reaction efficiency and cost.

[0004] In summary, a laboratory condensation apparatus for the synthesis of phenolic resins is proposed. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a laboratory condensation device for phenolic resin synthesis, which has a simple structure, is easy to use, has high condensation efficiency, and low maintenance cost.

[0006] The technical solution adopted in this utility model is as follows: a laboratory condensation device for phenolic resin synthesis, including a reaction vessel, a reflux device connected to the upper end of the reaction vessel, a condenser tube a connected below the reflux device, a wastewater tank connected to the bottom of the condenser tube a, two connection ports on the upper part of the wastewater tank, one connected to the condenser tube a and the other connected to the condenser tube b, a filter device is provided at the connection port of the wastewater tank to the condenser tube b, a cold trap is connected to the top of the condenser tube b, one end of the cold trap is connected to the condenser tube b, and the other end is connected to a vacuum pump; the upper end of the condenser tube a is provided with a coolant outlet a and the lower end with a coolant inlet a, the coolant outlet a and the coolant inlet a are respectively connected to the upper end and the lower end of the inner tube of the condenser tube a; the upper end of the condenser tube b is provided with a coolant outlet b and the lower end with a coolant inlet b, the coolant outlet b and the coolant inlet b are respectively connected to the upper end and the lower end of the inner tube of the condenser tube b; the coolant outlet a and the coolant inlet b are connected to a circulating refrigeration water pump, and the coolant inlet a is connected to the coolant outlet b.

[0007] The reflux device includes a connecting pipe a, which is connected to the exhaust port at the top of the reactor by a clamp. The other end of the connecting pipe a is connected to a reflux funnel. The top of the reflux funnel is provided with an upper outlet, and a plug is provided inside the upper outlet. The bottom of the reflux funnel is provided with a lower outlet, which is connected to the top of the condenser pipe a.

[0008] Condenser a and condenser b are spiral condensers. Both condenser a and condenser b include an upper inlet and a lower outlet. The upper inlet of condenser a is connected to the lower outlet of the reflux funnel, and the lower inlet of condenser a is connected to a drain pipe via a clamp. The drain pipe is connected to connection port a on the left side of the wastewater tank. The upper outlet of condenser b is connected to a cold trap, and the lower inlet is connected to a steam pipe via a clamp. The steam pipe is connected to a filter device on the right side of the wastewater tank, and the filter device is connected to connection port b on the right side of the wastewater tank.

[0009] The bottom of the wastewater tank is equipped with a support device, which includes support legs at the four corners. The support legs are connected to the four corners of the support plate. A circular opening is opened in the middle of the support plate, and the wastewater tank is placed in the circular opening. The bottom of the wastewater tank is equipped with a drain outlet, which is connected to a drain valve.

[0010] The coolant outlet a of condenser tube a is connected to the inlet of the circulating chilled water pump via connecting pipe b, the coolant inlet b of condenser tube b is connected to the outlet of the circulating chilled water pump via connecting pipe c, and the coolant inlet a of condenser tube a and the coolant outlet b of condenser tube b are connected via connecting pipe d.

[0011] The filtration device includes a cylindrical filter screen, which is installed in the connection port b at the right end of the wastewater tank. The upper end of the filter screen is connected to a steam pipe, which is connected to the connection port b at the right end of the wastewater tank by a clamp. A sealing gasket is provided between the connection port b and the steam pipe.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention features a simple structure and is easy to use. It effectively filters high-freezing-point solvents through a filter screen and performs three-stage condensation via condenser a, condenser b, and a cold trap, improving condensation efficiency without requiring additional equipment customization. When the high-freezing-point solvent sublimates and precipitates in condenser a due to the decrease in temperature, the accompanying water vapor liquefies and flushes it into the wastewater tank, thus preventing it from entering the vacuum pump. It boasts high condensation efficiency with a water vapor rejection rate of over 90%, reducing maintenance procedures and costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] The diagram is labeled as follows: 1. Reactor; 2. Condenser a, 21. Coolant outlet a, 22. Coolant inlet a; 3. Condenser b, 31. Coolant outlet b, 32. Coolant inlet b; 4. Wastewater tank, 41. Connection port a, 42. Connection port b, 43. Filter device, 44. Support device, 441. Support leg, 442. Support plate, 45. Drain outlet, 46. Drain valve; 5. Cold trap; 6. Vacuum pump; 7. Reflux device, 71. Connecting pipe a, 72. Reflux funnel, 73. Upper outlet, 74. Lower outlet; 8. Connecting pipe b, 81. Connecting pipe c, 82. Connecting pipe d, 83. Drain pipe, 84. Steam pipe; 9. Circulating refrigeration water pump. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0017] As shown in the figure, a laboratory condenser for phenolic resin synthesis includes a reaction vessel 1. A reflux device 7 is connected to the upper end of the reaction vessel 1. The reflux device 7 includes a connecting pipe a71, which is connected to an exhaust port located at the upper end of the reaction vessel 1 via a clamp. The other end of the connecting pipe a71 is connected to a reflux funnel 72. The top of the reflux funnel 72 has an upper outlet 73 with a plug inside. The bottom of the reflux funnel 72 has a lower outlet 74 connected to the top of a condenser tube a2. A coolant outlet a21 is located on the upper side of the condenser tube a2. A coolant inlet a22 is provided at the lower end of the condenser tube a2. Coolant outlet a21 and coolant inlet a22 are respectively connected to the upper and lower ends of the inner tube of the condenser tube a2. A condenser tube b3 is provided beside the condenser tube a2. A coolant outlet b31 is provided at the upper end of the side of the condenser tube b3, and a coolant inlet b32 is provided at the lower end of the side. Coolant outlet b31 and coolant inlet b32 are respectively connected to the upper and lower ends of the inner tube of the condenser tube b3. The coolant outlet a21 of the condenser tube a2 is connected to the inlet of the circulating chilled water pump 9 via a connecting pipe b8. The coolant inlet b3 of the condenser tube b3... The outlet of the circulating cooling water pump 9 is connected via connecting pipe c81. The coolant inlet a and coolant outlet b31 are connected via connecting pipe d82. The top of the condenser pipe b3 is connected to the cold trap 5, one end of the cold trap 5 is connected to the condenser pipe b3, and the other end is connected to the vacuum pump 6. The inlet at the lower end of the condenser pipe a2 is connected to the drain pipe 83 via a clamp. The drain pipe 83 is connected to the connection port a41 at the upper left end of the wastewater tank 4. The upper right end of the wastewater tank 4 is provided with a connection port b42, which contains a filter device 43. The filter device 43 is a cylindrical filter screen. 2. A steam pipe 84 is connected by a clamp, and a sealing gasket is provided between the connection port b42 and the steam pipe 84; the upper end of the filter device 43 is connected to the steam pipe 84, and the steam pipe 84 is connected to the lower end of the condenser pipe b3 by a clamp; the bottom of the wastewater tank 4 is provided with a support device 44, which includes support legs 441 set at the four corners, the support legs 441 are connected to the four corners of the support plate 442, the support plate 442 has a circular opening in the middle, and the wastewater tank 4 is placed in the circular opening; the bottom of the wastewater tank 4 is provided with a drain outlet 45, which is connected to a drain valve 46.

[0018] This laboratory condensation apparatus for phenolic resin synthesis operates by running a circulating cooling water pump 9, a vacuum pump 6, and a cold trap 5. Coolant from the circulating cooling water pump 9 enters the inner tube of the condenser tube b3 through the coolant inlet b32, then enters the coolant inlet a22 through the coolant outlet b31, then enters the inner tube of the condenser tube a2, and finally exits through the coolant outlet a21, passing through the connecting pipe b8 back into the circulating cooling water pump 9. Phenolic resin synthesis begins in the reaction vessel 1. Water vapor undergoes initial condensation through the condenser tube a2 and enters the wastewater tank 4. The remaining water vapor then passes through a filter device 43. The solvent enters the condenser tube b3 and then passes through the cold trap 5 to prevent high-freezing-point solvents from entering the vacuum pump 6. This invention has a simple structure and is easy to use. It effectively filters high-freezing-point solvents through the filter device 43 and performs three-stage condensation through the condenser tube a2, condenser tube b3 and cold trap 5, which improves the condensation effect without requiring additional equipment customization. When the high-freezing-point solvent sublimates and precipitates in the condenser a2 due to the decrease in temperature, the accompanying water vapor liquefies and flushes it into the wastewater tank 4, thereby preventing it from entering the vacuum pump 6. It has high condensation efficiency and a water vapor rejection rate of over 90%. It also reduces maintenance procedures and costs.

Claims

1. A laboratory condensation apparatus for phenolic resin synthesis, comprising a reaction vessel, wherein a reflux device is connected to the upper end of the reaction vessel, characterized in that: The reflux device is connected to condenser tube a at the bottom, and condenser tube a is connected to a wastewater tank at the bottom. The wastewater tank has two connection ports at the top, one connecting to condenser tube a and the other connecting to condenser tube b. A filter device is installed at the connection port between the wastewater tank and condenser tube b. The top of condenser tube b is connected to a cold trap, one end of which is connected to condenser tube b, and the other end is connected to a vacuum pump. Condenser tube a has a coolant outlet a at the top and a coolant inlet a at the bottom, which are connected to the upper and lower ends of the inner tube of condenser tube a, respectively. Condenser tube b has a coolant outlet b at the top and a coolant inlet b at the bottom, which are connected to the upper and lower ends of the inner tube of condenser tube b, respectively. Coolant outlet a and coolant inlet b are connected to a circulating chilled water pump, and coolant inlet a is connected to coolant outlet b.

2. The laboratory condenser for phenolic resin synthesis according to claim 1, characterized in that: The reflux device includes a connecting pipe a, which is connected to the exhaust port at the top of the reactor by a clamp. The other end of the connecting pipe a is connected to a reflux funnel. The top of the reflux funnel is provided with an upper outlet, and a plug is provided inside the upper outlet. The bottom of the reflux funnel is provided with a lower outlet, which is connected to the top of the condenser pipe a.

3. The laboratory condenser for phenolic resin synthesis according to claim 2, characterized in that: Condenser a and condenser b are spiral condensers. Both condenser a and condenser b include an upper inlet and a lower outlet. The upper inlet of condenser a is connected to the lower outlet of the reflux funnel, and the lower inlet of condenser a is connected to a drain pipe via a clamp. The drain pipe is connected to connection port a on the left side of the wastewater tank. The upper outlet of condenser b is connected to a cold trap, and the lower inlet is connected to a steam pipe via a clamp. The steam pipe is connected to a filter device on the right side of the wastewater tank, and the filter device is connected to connection port b on the right side of the wastewater tank.

4. A laboratory condenser for phenolic resin synthesis according to claim 3, characterized in that: The filtration device includes a cylindrical filter screen, which is installed in the connection port b at the right end of the wastewater tank. The upper end of the filter screen is connected to a steam pipe, which is connected to the connection port b at the right end of the wastewater tank by a clamp. A sealing gasket is provided between the connection port b and the steam pipe.

5. A laboratory condenser for phenolic resin synthesis according to claim 1, characterized in that: The bottom of the wastewater tank is equipped with a support device, which includes support legs at the four corners. The support legs are connected to the four corners of the support plate. A circular opening is opened in the middle of the support plate, and the wastewater tank is placed in the circular opening. The bottom of the wastewater tank is equipped with a drain outlet, which is connected to a drain valve.

6. A laboratory condenser for phenolic resin synthesis according to claim 1, characterized in that: The coolant outlet a of condenser tube a is connected to the inlet of the circulating chilled water pump via connecting pipe b, the coolant inlet b of condenser tube b is connected to the outlet of the circulating chilled water pump via connecting pipe c, and the coolant inlet a of condenser tube a and the coolant outlet b of condenser tube b are connected via connecting pipe d.

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